A355562 Number of blunt polypons with n cells.

0, 1, 1, 2, 1, 5, 3, 10, 13, 31, 44, 103, 169, 360, 643, 1317, 2479, 5036, 9716, 19592, 38511, 77465, 153686, 309093, 617426, 1243392, 2496186, 5035612

Offset: 1

Author

Sean A. Irvine, Jul 06 2022

Keywords

• nonn
• nice
• hard
• more

Comments

Polypons are defined in A057784. A blunt polypon is a polypon with no internal angle of 30 degrees.

Comments by Joseph Myers in A057784 regarding division of hexagons also apply to this sequence.

Links

• Andrew Clarke, Other Polyforms [beware of errors for this particular form]
• Sean A. Irvine, Java program (github)
• Sean A. Irvine, The 5 blunt 6-pons
• Sean A. Irvine, The 44 blunt 11-pons

Crossrefs

Cf. A057784, A057785 (erroneous version).